-39.7% is the change from 398 to 240
Calculation steps:
[( 240 - 398 ) ÷ 398] x 100 = -39.7%
Formula
Percentage change = [(240 - 398) / 398] x 100
Subtract the new number by the original number
240 - 398 = -158
-158 ÷ 398 = -0.3969849246231156
-0.3969849246231156 x 100 = -39.7%